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Unread 12-12-2008, 06:11 PM   #1
Lunchbox2011
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1987 YJ Wrangler 
 
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87 idles fine but stalls on acceleration

I just got this jeep today, knowing it had some sort of engine problem, I was told it was the carburetor. It's not the original engine and a lot of things are mickey moused. It had a little bit of old gas in it, so we put some new gas in, and it ran a better. We suspect it might be a fuel filter problem, or it may actually be the carburetor as we were told. I was just wondering what everyone else thought the problem may be, as my dad and I have limited mechanical experience.

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Unread 12-12-2008, 06:18 PM   #2
Toms87
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1987 YJ Wrangler 
 
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What engine? What carb?
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Unread 12-12-2008, 06:58 PM   #3
Lunchbox2011
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1987 YJ Wrangler 
 
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We're pretty sure the engine is a 258 straight 6 and I know the carb is a carter and says 0-2681 on it
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Unread 12-13-2008, 12:24 AM   #4
Old4X
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Check your timing and ignition first.

Severe bog or stall on acceleration points to the accelerator pump in the carb.

Get a carb overhaul kit and go through the carb. The pump will be included in the kit.
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Unread 12-13-2008, 06:12 AM   #5
Lunchbox2011
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Ok, I'll look into that. How do I know what carb I have from the numbers I found on it?
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Unread 12-13-2008, 07:20 AM   #6
Alfons
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Also, check your vacuum advance to your distributor.
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Unread 12-13-2008, 07:52 AM   #7
Lunchbox2011
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vacuum advance was fine, would the EGR valve have anything to do with it? There's no vacuum line connected to it and my dad said there should be. It also looks a bit clogged
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Unread 12-14-2008, 12:41 PM   #8
Lunchbox2011
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The EGR valve helped a little, still some hesitation and stalling. We're beginning to look at the fuel pump. One of the PO's installed an electric fuel pump, and we suspect it might not be doing enough, causing the engine to idle fine but stall out when accelerating. Does anyone know what PSI and GPH the stock Carter BBD carb needs? I haven't been able to find it anywhere.

Also sorry for all the double posts.

EDIT: We discovered that the fuel pressure should be between 4-5 PSI. The pump the PO installed is 2.5-4.5 PSI. Is this enough, or would we need a slightly higher PSI rating?

Last edited by Lunchbox2011; 12-14-2008 at 12:53 PM..
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Unread 01-22-2009, 11:43 PM   #9
kitty125
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Hi, I'm new but having the same prob. you have. Just replaced the fuel pump and no change. Just wondering if you got anywhere. Oh 4.2 6L Stright Drive
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Unread 01-22-2009, 11:53 PM   #10
Pittsbuilder
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with a clean fuel filter, that might be enough fuel pressure. Is your jeep stock, with all the emissions junk on there? If so, This link is a great resource for troubleshooting http://home.sprynet.com/~dale02/list.htm If it has been modified, It would help greatly to know what mods have been done, or what emissions equipment has been bypassed. My personal recommendation would be for you to bypass the emissions and ECU, and swap out the carter carb for a weber or an MC2100. Also, The engine driven pump for your jeep is already set up for the correct fuel pressure, and they only cost about 20 bucks. You might want to get rid of the electric pump and reinstall a mechanical one
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Unread 01-23-2009, 09:04 AM   #11
Old4X
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Before you go ripping into it, check to make sure your accelerator pump is working.

With engine off, look down the carb throat and work the linkage several times. You should get 2 squirts of fuel every time you work the linkage. Not a dribble, not 1 squirt.

If no squirts, google "BBD Idle Problem" it is related to the accel pump as well. If that is the problem, it is a cheap fix.
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Unread 01-23-2009, 09:50 AM   #12
dodger889
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See that you are in the new egland states you have to pass emissions up there some off the repairs would require you to change the emissions controls. Which is a no go for you (sorry check your with the local testing center what they will let you do or not) If they just tail pipe sniff then you can do alot to get pass them. I they have under the hood inspections then that is a new story. That would be a starting point. You could do what is called a "nutter bypass" just hide the wires that is done in the bypass.
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